Onsager-Casimir frustration from resistance anisotropy in graphene quantum Hall devices.
- Resource Type
- Academic Journal
- Authors
- Hu IF; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Department of Physics, National Taiwan University, Taipei 10617, Taiwan.; Panna AR; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Rigosi AF; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Kruskopf M; Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.; Patel DK; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Department of Physics, National Taiwan University, Taipei 10617, Taiwan.; Liu CI; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.; Saha D; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Payagala SU; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Newell DB; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Jarrett DG; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.; Liang CT; Department of Physics, National Taiwan University, Taipei 10617, Taiwan.; Elmquist RE; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA.
- Source
- Publisher: American Physical Society Country of Publication: United States NLM ID: 101677937 Publication Model: Print Cited Medium: Print ISSN: 2469-9950 (Print) NLM ISO Abbreviation: Phys Rev B Subsets: PubMed not MEDLINE
- Subject
- Language
- English
- ISSN
- 2469-9950
We report on nonreciprocity observations in several configurations of graphene-based quantum Hall devices. Two distinct measurement configurations were adopted to verify the universality of the observations (i.e., two-terminal arrays and four-terminal devices). Our findings determine the extent to which epitaxial graphene anisotropies contribute to the observed asymmetric Hall responses. The presence of backscattering induces a device-dependent asymmetry rendering the Onsager-Casimir relations limited in their capacity to describe the behavior of such devices, except in the low-field classical regime and the fully quantized Hall state. The improved understanding of this quantum electrical process broadly limits the applicability of the reciprocity principle in the presence of quantum phase transitions and for anisotropic two-dimensional materials.
Competing Interests: The authors declare no competing interest.